Hi Sharma, After 12th you can go for Law courses - LLB (3 years), B.A LLB/ B.com LLB/ BBA LLB (5 years), and then can apply for LLM (If you want - one/two year)...

Some Colleges are - 

Fergusson College, Pune

Symbiosis College, Pune

Gujarat National Law University, Gandhinagar

Dr. Ram Manohar Lohia National Law University, Lucknow

National Law University, Delhi, New Delhi

Best of luck